ProcessMaster FEP610, HygienicMaster FEH610
| OI/FEP610/FEH610-EN Rev. B 71
9
Maintenance
9.1
Safety instructions
WARNING
Risk of injury due to live parts!
When the housing is open, contact protection is not provided
and EMC protection is limited.
Before opening the housing, switch off the power supply.
CAUTION
Risk of burns due to hot measuring media.
The device surface temperature may exceed 70 °C (158 °F),
depending on the measuring medium temperature!
Before starting work on the device, make sure that it has
cooled sufficiently.
NOTE
Damage to components!
The electronic components of the printed circuit board can
be damaged by static electricity (observe ESD guidelines).
Make sure that the static electricity in your body is
discharged before touching electronic components.
Corrective maintenance work may only be performed by
trained personnel.
— Before removing the device, depressurize it and any
adjacent lines or containers.
— Check whether hazardous materials have been used as
materials to be measured before opening the device.
Residual amounts of hazardous material may still be
present in the device and could escape when it is opened.
Within the scope of operator responsibility, check the following
as part of a regular inspection:
— the pressure-carrying walls / lining of the pressure device
— the measurement-related function
— the leak tightness
— the wear (corrosion)
9.2
Flowmeter sensor
The flowmeter sensor is largely maintenance-free.
The following items should be checked annually:
— Ambient conditions (air circulation, humidity)
— Seal integrity of the process connections
— Cable entry points cover gaskets and cover screws
— Operational reliability of the power supply feed, the
lightning protection, and the grounding
The flowmeter sensor electrodes must be cleaned when the
flowrate information on the transmitter changes when
recording the identical flowrate volume.
If the display shows a higher flowrate, the contamination is
insulating.
If a lower flowrate is displayed, the contamination results in a
short-circuit.
For repairs to the lining, electrodes or magnet coil, the
flowmeter must be returned to the manufacturer.
See chapter "Returning devices" on page 76.
9.2.1
Gaskets
Some device designs are shipped with special gaskets. These
gaskets must be used and installed properly to prevent
leakage and ensure 3A conformity.
For all other device designs, use commercially available
gaskets made from a compatible material for the measuring
medium and prevailing temperature (rubber, PDFE, lt, EPDM,
silicon, Viton, etc.) or use 3A-compliant gasket material for
HygienicMaster devices.
A wafer type sensor is installed without gaskets directly in the
pipeline.
9.3
Cleaning
When cleaning the exterior of meters, make sure that the
cleaning agent used does not corrode the housing surface and
the seals.
To avoid static charge, a damp cloth must be used for
cleaning.
